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holl_ands | Home > Multi-Bay Dipole Antennas > Browse:UHF 3-Bay Fat Dipole + 16 RR - OPTUHF 3-Bay Fat Dipole + 12RR - OPTUHF 3-Bay FAT Dipoles + 12 Pair RR - OPTW-G HD-4400 4-Bay Dipole - NO ReflectorW-G HD-4400 4-Bay Dipole with ReflectorUHF 4-Bay Fat Dipoles + Grid ReflectorUHF Vertical 8-Bay Dipole - NO ReflectorUHF Vertical 8-Bay Dipoles + 43RRUHF Vert 8-Bay Dipole + 43 Pair RR - OPTWinegard HD-8800 8-Bay FAT Dipoles
UHF 3-Bay Fat Dipole + 12RR - OPT UHF 3-Bay Fat Dipole with 12 Reflector Rods analyzed using 4nec2 after determining dimensions using nikiml's Python Optimization Scripts.  Reflector Rod-to-Rod Separation was presumed to be 2-in for an existing set of 3 ea Reflector Sub-Assemblies with 4RR each. UHF Raw Gain = 10.9 to 12.5 dBi, F/B & F/R Ratio Min = 17.7 dB and SWR (300-ohms) under 2.7. Hi-VHF Raw Gain Forward is low but usable on Ch7-9 & Ch13, but toward REAR is higher on Ch10-12. Hi-VHF SWR (300-ohms) is Excessive. ASSUMED DIMENSIONS (all in inches): Rdip=0.4375 = Radius of Dipole Elements (7/8-in O.D. in this model) Rfeed=0.06425 = Radius of Feedline (AWG8 in this model) DSwp=0 = Dipole Forward Sweep [If any, zero in this model] Hop=1.0 = Separation at Crossovers RR=2.0 = Reflector Rod-to-Rod Separation Rrod=0.1875 = Radius of Reflector Rods OPTIMIZED DIMENSIONS (rounded to nearest 1/8-in): DDSep=10.25 = Dipole-To-Dipole Separation DLen=5.875 = Dipole Half-Length [Excludes Feedline Gap] FeedSep=3.375 = Separation between FEEDLINE wires ZCross=1.75 = From Center of Feedline Cross-Over to Center of OUTER Dipoles RS=4.5 = Reflector Rod Separation behind Hourglass YRod=13.5 = Reflector Rod Half-Lengths ERRATA (21Aug2014): Uploaded Corrected 4nec2 File, which had "16RR" rather than "12RR" in Comments. Date(s): 20 Aug 2014. Album by holl_ands. 1 - 24 of 24 Total. 6355 Visits.
enlarge 84KB, 577x1024 1 UHF 3-Bay Dipole + 12RR - OPT 3D View enlarge 287KB, 1024x900 2 UHF 3-Bay Dipole + 12RR - OPT Front View [1 large square = 2.5 inches] enlarge 104KB, 365x1024 3 UHF 3-Bay Dipole + 12RR - OPT Top View [1 large square = 2.5 inches] enlarge 177KB, 1024x690 4 UHF 3-Bay Dipole + 12RR - OPT UHF Raw Gain = 10.9 to 12.5 dBi UHF F/B & F/R Ratio Minimum = 17.7 dB enlarge 177KB, 1024x690 5 UHF 3-Bay Dipole + 12RR - OPT UHF SWR (300-ohms) Under 2.7 enlarge 216KB, 1024x690 6 UHF 3-Bay Dipole + 12RR - OPT UHF Impedance enlarge 300KB, 1024x1024 7 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 470 MHz enlarge 301KB, 1024x1024 8 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 530 MHz enlarge 301KB, 1024x1024 9 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 590 MHz enlarge 301KB, 1024x1024 10 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 650 MHz enlarge 301KB, 1024x1024 11 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 698 MHz enlarge 300KB, 1024x1024 12 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 798 MHz enlarge 308KB, 1024x1024 13 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 806 MHz enlarge 34KB, 791x1024 14 UHF 3-Bay Dipole + 12RR - OPT 4nec2 File enlarge 118KB, 420x1024 15 UHF 3-Bay Dipole + 12RR - OPT Side View [1 large square = 2.5 inches] enlarge 175KB, 1024x690 16 UHF 3-Bay Dipole + 12RR - OPT Hi-VHF Gain is 6-4 dBi on Ch7-9 and 8 dBi on Ch13, with more to REAR on Ch10-12 enlarge 202KB, 1024x690 17 UHF Raw Gain = 10.9 to 12.5 dBi Hi-VHF SWR (300-ohms) is Excessive enlarge 222KB, 1024x690 18 UHF Raw Gain = 10.9 to 12.5 dBi Hi-VHF Impedance enlarge 302KB, 1024x1024 19 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 174 MHz enlarge 303KB, 1024x1024 20 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 192 MHz enlarge 304KB, 1024x1024 21 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 198 MHz enlarge 306KB, 1024x1024 22 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 207 MHz enlarge 302KB, 1024x1024 23 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 210 MHz enlarge 302KB, 1024x1024 24 UHF 3-Bay Dipole + 12RR - OPT Azimuthal Pattern at 216 MHz
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